/Engine/Plugins/Developer/Concert/ConcertMain/Source/ConcertTransport/Public/IConcertEndpoint.h
Add a Request Handler
virtual void InternalAddRequestHandler ( const [FName](API\Runtime\Core\UObject\FName) & RequestMessageType, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IConcertRequestHandler](API\Plugins\ConcertTransport\IConcertRequestHandler) > & Handler )